Water Treatment Operator 50 Question Practice Test

Welcome to the Water Treatment Operator 50 Question Practice Test.

Choose the best possible answer to the question.

What test is used to determine the presence of coliform bacteria?

DPD

Physical

Presumptive

Multiple Choice

One ton chlorine containers are equipped with two valves, one for liquid and one for gas.

True

False

A change in the water elevation from the normal level to the pumping level is?

Residual

Drawdown

Demand

Flux Leveling

The injection of fluoride should be as far away as possible from any chemical containing?

Calcium

Aluminum from Alum

Chlorine

Soda Ash

What is the most advantageous application point for powdered activated carbon?

After Coagulation

In the Filters

Raw Water Intake

After Oxidation with Chlorine

Waterborne diseases like typhoid and cholera are caused by?

Viruses

E.Coli

Bacteria

Cryptosporidium

What is the MCL for HAA5s?

0.040 mg/L

0.060 mg/L

0.080 mg/L

What agency should be called for actual hands on assistance if a substantial chlorine leak incident occurs?

Chemical Transportation Emergency Center

Chlorine Institute

Occupational Safety and Health Administration

Transportation Emergency Institute

What is the most effective disinfection residual?

Chloride (NaCl)

Sulfur (S)

Alum (Al)

Hypochlorous Acid (HCLO)

10.

When doing coliform analysis use the presence-absence method, a sample should be incubated for?

12 and 14hrs at 76 degrees Celsius

24 and 48hrs at 35 degrees Celsius

5 and 8hrs at 22 degrees Celsius

14 and 16hrs at 33 degrees Celsius

11.

Pulsator clarifiers are used to?

Treat water that is high in color and high in turbidity

Treat water that is high in color and low in turbidity

Treat water that is low in color and low in turbidity

Treat water that is low in color and high in turbidity

12.

The hour during the day when the largest volume of water is being pumped is known as peak hourly flow?

True

False

13.

A system that fails to collect water samples in their distribution system would fall under which public notification system?

Tier I

Tier II

Tier III

No Need to Notify

14.

Filter alum and polymer compounds are primarily

for increasing the pH of the finished water

designed to settle colloids

for suppling the flux capacitor with saturation

All of the above

15.

What chemical oxidant would be most effective for controlling biological growth?

Chlorine

Ozone

HAA5s

16.

Notification to the public of a Tier III violation is done

Within 24hrs

Within 48hrs

Notify within 12 months usually in the CCR

Never Tell the consumers because it will cause irrational fear

17.

When using the lime soda ash process, it is impossible to produce water with a hardness of less than?

50 mg/L

25 mg/L

100 mg/L

105 mg/L

18.

What conventional treatment step is eliminated by direct filtration?

Coagulation

Flocculation

Sedimentation

Filtration

19.

Which is not considered to be a waterborne disease?

Giardia lamblia

Cryptosporidium Parvum

Legionella Pneumophila

Mumps Virus

20.

What is the best disinfectant against Cryptosporidium?

Chlorine

Ozone

Chloramines

All of the Above

21.

What parameter must be much better than conventional treatment basins in basins using tube and plate settlers?

Floc rate must be 2 to 3 times slower than conventional basins

Floc must have good settling characteristics

Floc rate must be 4 to 6 times slower than conventional basins

Metals must be oxidized

22.

Permanganate reactions are highly dependent on?

Water Temperature

Chlorine Residual

Alum Level

23.

Where are the two points on a gravity filter used to measure head loss located?

At the water level and at the filter outlet

At the sand level and at the water level

At the filter inlet and the basin

At the filter outlet and inlet

24.

What is the term that defines the calculation of a water plants physical property due wear and tear?

Usage

Pump Curve

Depreciation

None of the Above

25.

What is the definition of decant?

To draw off a liquid layer from a vessel of any size without disturbing any layers above or below

To draw off the sediment at the bottom of a vessel of any size without disturbing the overlying liquid layer

To remove the precipitate at the bottom of any size vessel

To draw off the liquid from a vessel of any size without stirring up bottom sediment

26.

What will accurately measure 500mL solution?

Measuring Cup

Beaker

Anything larger than 500-mL

500-mL Volumetric Flask

27.

If the chlorine demand suddenly increases from 0.4 mg/L to 2.8 mg/L, what could be the reason?

The water temperature is increasing

The chlorinator is clogged

Pollution

Erratic well pump operation

28.

The porous material just above the water table that holds small quantities of water by capillary action is called?

Capillary Fringe

Alluvial

Spring

Venturi

29.

The continuous circulation of water from the earth into the atmosphere and back again is called?

Hydrologic Cycle

Evaporation Cycle

Hydraulic Cycle

Paleo Cycle

30.

What organism can escape coagulation and then pass through a granular filter?

Cryptosporidium

Giardia

Naegleria

Entamoeba

31.

All chlorine gas rooms...

Should have lights and fans on the inside and wired to the same switch

Should have a window in the door so an operator can look into the room to detect any abnormal conditions

Be fitted with chlorine resistant power exhaust fans ducted out at ceiling level

Should have sealed walls and doors that open inward

32.

What form is Giardia most infectious?

Cyst

Trophozoite

Protozoan

Gel

33.

What is an inorganic particle that is stabilized in water by attracting a layer of oppositely charged ions surrounded by a diffuse layer of counterions?

Electrochemical Particle

Hydrophobic Particle

Imbalanced Particle

Flux Particle

34.

What is the best probable solution if rotifers are visible in finished water?

Use oxygen deprivation

Super chlorinate the water plant

Use aeration followed by lime softening before the settling process

Optimize coagulation, flocculation, and filtration

35.

Which forces will pull particles together once they have been destabilized in the coagulation-flocculation process?

Van der Waals Forces

Gravitational Forces

G-Forces

Pressure Force

36.

What is the most favorable raw water condition for good flocculation?

High pH and High Alkalinity

Low pH and High Alkalinity

Low pH and Low Alkalinity

High pH and Low Alkalinity

37.

Viruses are sometimes resistant to disinfection.

True

False

38.

What should an authorized entrant do before he/she enters a permitted confined space?

Verify the availability of rescue services

Put on SCUBA gear

Verify the internal atmosphere of the space is tested to measure oxygen content, presence of flammable gasses, and vapors, and potentially toxic air contaminants

None of the above

39.

What is the MCLG for chloride?

250 mg/L

142 mg/L

45 ppm

0 mg/L

40.

What is used as part of a sedimentation basin to allow a controlled flow of the supernatant to be collected and directed to the filter beds?

Launder

Diverter

Weir

Bar Cage

41.

What does total alkalinity refer to?

Total amount of carbonate, bicarbonate and hydroxide in solution

The amount of alkaline in Cl2

The amount of pH in raw water only

None of the Above

42.

Monthly sampling results must be reported by the water purveyor?

Daily

One the 1st of each month

Every 12 months

Within the first 10 days of the month following the month in which the samples were taken

43.

Which is the best removal method if a well contains soluble iron?

Install a manganese greensand filter and regenerate with potassium permanganate using a chemical feeder

Adjustment to Cl2 Feed

Add Filters

Increase Filter Runs

44.

Why do mud balls and hard spots develop in high rate gravity filters during the summer months?

The heat makes the water too had and then gets sticky

The flow is too low because of lack of raw water

The water becomes too hard and effects the filters

Sedimentation is not as good in the summer months because the flows are higher and more floc is imbedded onto the filters

45.

What effect will an increase in total dissolved solids in water to be treated be?

An increase in the time required for coagulation

An increase in Methane

A decrease in pH

In increase in free chlorine residual

46.

Water that is softened has a high pH and a high concentration of CaCO3. Therefore stabilization is essential in order to prevent the CaCO3 from precipitating out on?

Household Plumbing

The clear well

The filters

Distribution Pipes

47.

What does a low pH favor the formation of?

Total Trihalomethanes

Haloacetic Acids

Both Haloacetic Acids and Total Trihalomethanes

Neither Haloacetic Acids and Total Trihalomethanes

48.

What is the most probable solution if nematodes are interfering with the disinfectant?

Use chloramines

Use oxygen deprivation

Decrease detention time of finished water

Optimize the settling process

49.

What is the principle form of alkalinity found in raw water from both surface and ground sources?

Fluoride

Alum

Calcium Bicarbonate

Hydrochloric Acid

50.

What gas can cause lung and skin irritation?

Oxygen

Chlorine

Diesel

Magnesium

1 out of 5

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